CHEMOSPHERE
·
2022
·
IF 8.943
Ying Xiong,Yumei Zhao,Weijun Shan,Xiaogeng Feng,Junshuo Cui,Zhenning Lou,Guoxiang Shao,Min Dong,Haibiao Yu
In order to enhance the catalytic performance of the Gd-modified Co 3 O 4 catalyst (Gd 0.06 Co) for the N 2 O decomposition, alkali metal K was introduced as the promoter by impregnating the Gd 0.06 Co powder with an aqueous solution of KNO 3 (with K/Co ratios 0.01–0.05). With the doping of K, the catalytic activity over Gd 0.06 Co was significantly improved and the temperature of N 2 O complete decomposition was decreased from 350 °C to 300 °C. Combining the results of XPS and O 2 -TPD, the superior catalytic performance of the optimum catalyst K 0.025 Gd 0.06 Co was mainly owing to the synergistic effect of Gd and K, which weakened the Co–O bond and endowed the catalyst surface with much more amount of oxygen vacancies. Even under the coexist of the impurity gases, such as 5 vol% O 2 , 100 ppmv NO and 2 vol% H 2 O, the K 0.025 Gd 0.06 Co catalyst exhibited prominently better catalytic activity than Gd 0.06 Co and K 0.025 Co catalysts.
研究领域:
催化化学
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环境科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF PHYSICAL CHEMISTRY B
·
2023
·
IF 3.3
Lu Li,Meng Kou,Yongda Wang,Feng Qin,Hua Zhao,Zhiguo Zhang
The oxygen-varying correlated fluorescence provides an effective strategy to gain the quenching constant KSV for a non-phosphorescent system. Owing to the absence of detectable phosphorescence emission in general optical spectroscopy, the facticity of this method has never been verified. Here, the correct way to determine KSV by oxygen-varying correlated fluorescence was systematically studied in detail. We selected gadolinium protoporphyrin IX (Gd-PpIX) to establish a fluorescence and phosphorescence dual emission system. Then, KSV of Gd-PpIX can be obtained by the change of fluorescence intensity (IF) with oxygen concentration using the method of correlated fluorescence at intense pump power; meanwhile, the value can also be determined from the relationship of the phosphorescence intensity ratio and oxygen content by the Stern–Volmer equation under relatively low power density. It was found that the KSV values obtained by the above two methods were 12.2(1) and 11.9(7) kPa–1, respectively. Our results successfully verified the accuracy of oxygen-varying correlated fluorescence for determining the KSV by the phosphorescence property and fluorescence saturation of Gd-PpIX.
研究领域:
生物化学
·
医学检测
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2014
·Vol. 16
·期 2
·1-10
·
IF 2.278
Du Weimin,Zhang Youjuan,Wang Yanbin,Liu Junning,Lu Haiyang,Hou Suhan,Zhang Xiaohua
Abstract Zirconia modified by gadolinium (Gd/ZrO 2 ) nanocomposite has been successfully prepared by NaCl-assisted method. The effects of gadolinium introduction on phase, composition, optical properties, and photocatalytic activities were investigated in detail. Results reveal that the introduction of gadolinium could enlarge the lattice space, create structural defects, and restrict the product growth. At the same time, the generated structural defects further influence the optical properties of Gd/ZrO 2 nanocomposite with single phase. Photocatalytic experiments indicate that Gd 0.2 Zr 0.8 O 2− δ
nanocrystals have better visible-light-responsive photocatalytic activities which results from the special structural defect, smaller size (30–55 nm), and larger specific surface area (~50.60 m 2 /g). Hence, Gd 0.2 Zr 0.8 O 2− δ
nanocrystals are promising visible-light-responsive photocatalysts with potential prospects in wastewater treatment and environmental protection. Also, the present NaCl-assisted method might be generalized to synthesize other nanocomposite with more complicated structures. Graphical Abstract
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
Regenerative Biomaterials
·
2021
·Vol. 8
·期 6
·
IF 6.353
Yang Li,Fu Shengxiang,Cai Zhongyuan,Liu Li,Xia Chunchao,Gong Qiyong,Song Bin,Ai Hua
The T1−T2 dual-mode probes for magnetic resonance imaging (MRI) can non-invasively acquire comprehensive information of different tissues or generate self-complementary information of the same tissue at the same time, making MRI a more flexible imaging modality for complicated applications. In this work, three Gadolinium-diethylene-triaminepentaaceticacid (Gd-DTPA) complex conjugated superparamagnetic iron oxide (SPIO) nanoparticles with different Gd/Fe molar ratio (0.94, 1.28 and 1.67) were prepared as T1–T2 dual-mode MRI probes, named as SPIO@PEG-GdDTPA0.94, SPIO@PEG-GdDTPA1.28 and SPIO@PEG-GdDTPA1.67, respectively. All SPIO@PEG-GdDTPA nanocomposites with 8 nm spherical SPIO nanocrystals showed good Gd3+ chelate stability. SPIO@PEG-GdDTPA0.94 nanocomposites with lowest Gd/Fe molar ratio show no cytotoxicity to Raw 264.7 cells as compared to SPIO@PEG-GdDTPA1.28 and SPIO@PEG-GdDTPA1.67. SPIO@PEG-GdDTPA0.94 nanocomposites with r1 (8.4 mM−1s−1), r2 (83.2 mM−1s−1) and relatively ideal r2/r1 ratio (9.9) were selected for T1–T2 dual-mode MRI of blood vessels and liver tissue in vivo. Good contrast images were obtained for both cardiovascular system and liver in animal studies under a clinical 3 T scanner. Importantly, one can get high-quality contrast-enhanced blood vessel images within the first 2 h after contrast agent administration and acquire liver tissue anatomy information up to 24 h. Overall, the strategy of one shot of the dual mode MRI agent could bring numerous benefits not only for patients but also to the radiologists and clinicians, e.g. saving time, lowering side effects and collecting data of different organs sequentially.
研究领域:
医学影像学
·
纳米医学
·
生物医学工程
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产品关联
DOI
PubMed
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2022
·
IF 4.865
Zhuo Chen,Xiufang Cui,Yongchao Fang,Chao Yan,Rui Wang,Yongzhi Jing,Xinhe Wang,Guo Jin,Xiang Wang
Gd 2 O 3 and Sm 2 O 3 co-doped LZ ceramic ((La 0.5 Gd 0.25 Sm 0.25 ) 2 Zr 2 O 7 /YSZ) are designed and prepared by atmospheric plasma spraying (APS). It is the aim of this study to investigate the similarities and differences between co-doped sample and mono-doped samples, (La 0.5 Gd 0.5 ) 2 Zr 2 O 7 /YSZ and (La 0.5 Sm 0.5 ) 2 Zr 2 O 7 /YSZ on hot corrosion behaviors exposed to Na 2 SO 4 + V 2 O 5 molten salts . Thermodynamic calculations are used to predict the hot corrosion mechanism before experiments. Characterization and hot corrosion behavior are analyzed using X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and scanning electron microscope (SEM). Results indicate that the main hot corrosion products are composed of rare-earth vanadates ((La, Gd)VO 4 , (La, Sm)VO 4 and (La, Gd, Sm)VO 4 , respectively) and ZrO 2 . After 10 h of corrosion, the reaction layer evolves into trilayered structure containing Zr-rich layer, V-rich layer and mixed-layer. The formation mechanism is discussed in detail. The co-doped sample exhibits excellent degradation resistance, which can be attributed to the higher entropy value. The formation of the particular trilayered structure occurs earlier in the co-doped sample, which also provides a role in reducing the degradation rate of ceramics.
研究领域:
材料科学
·
表面工程
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产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2024
·Vol. 26
·期 19
·2518-2525
·
IF 2.6
Xixi Huang,Jinhai Yang,Hao Lu,Xieming Xu,Shuaihua Wang,Shaofan Wu
X-ray detectors based on scintillators are widely used in the fields of medical imaging, high-energy physics, geological exploration, and industrial detection. The development of scintillation materials with different characteristics has become the focus of considerable research interest. Herein, we report a facile hydrothermal synthesis of Gd- and Eu-codoped LiLuF4 microcrystals (MCs), which exhibit strong luminescence of Eu3+ ion characteristic emission, characterized by distinct red fluorescence emission. The research shows that Gd3+ co-doping effectively improved the sensitivity and light yield of LiLuF4:Eu MCs by regulating the proportion of co-doping ions. In addition, the detection limit is 140.72 nGy s−1 for LiLuF4:Eu,Gd MCs, approximately 39 times lower than the dose requirement of medical diagnosis. Based on LiLuF4:Eu,Gd MCs with the superior scintillation properties, a MC-composited film with 250 μm thickness was prepared by a direct coating method. The uniform and high-loading scintillation film exhibits outstanding imaging performance with a high spatial resolution of 14.8 LP mm−1, which confirms the application potential of X-ray imaging.
研究领域:
材料科学
·
医学影像学
·
光学
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产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2016
·Vol. 45
·期 42
·16889-16895
·
IF 4.177
Lixin Zang,Huimin Zhao,Jianyu Hua,Feng Qin,Yangdong Zheng,Zhiguo Zhang,Wenwu Cao
A mechanism for the enhanced room-temperature phosphorescence (RTP) of gadolinium-coordinated hematoporphyrin monomethyl ether (Gd-HMME) in the presence of imidazole and free gadolinium ions (Gd3+) is revealed. Imidazole, the molten solvent used in the synthesis of Gd-HMME, was effective in enhancing the Gd-HMME RTP. In the presence of imidazole, further enhancement of the Gd-HMME RTP was observed upon adding Gd3+. Overall, a 40-fold enhancement of Gd-HMME RTP intensity was achieved by adding both imidazole and Gd3+. In addition, there was an increase in the RTP lifetime. Through spectroscopic analysis, we deduced that a protective medium is formed by the imidazole and the degree of this protection is further increased by Gd3+. The protective medium enhances the Gd-HMME RTP by partially inhibiting energy transfer from the lowest triplet state of Gd-HMME to oxygen. This was demonstrated by the presence of lower levels of singlet oxygen in the Gd-HMME solution after the addition of imidazole. These results indicate that imidazole could have potential application as an RTP enhancer or triplet state protector.
研究领域:
化学
·
材料科学
·
光化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
VACUUM
·
2025
·
IF 3.9
Xiaoying Yu,Gala Sa,Aiju Xu
The coal chemical industry produces significant wastewater containing refractory organic pollutants, with quinoline being a particularly persistent contaminant in secondary biochemical effluents. To overcome the limitations of standard TiO 2 photocatalysts—specifically, their restricted light absorption range and rapid charge recombination—this work created Gd-doped TiO 2 (Gd-TiO 2 ) catalysts using a hydrothermal approach. Comprehensive characterization showed that the optimal 1.5 % Gd-TiO 2 presents three primary advantages: (1) a 55 % increase in specific surface area (174 m 2 g −1 ), (2) enhanced visible-light absorption through bandgap reduction (3.06 eV), and (3) improved charge separation. These modifications enabled the 1.5 % Gd-TiO 2 catalyst to achieve 84 % quinoline degradation within 3 h (mineralization rate: 53.2 %), maintaining 80.3 % efficiency after four cycles, demonstrating exceptional stability. Mechanistic studies revealed a hydroxyl radical-dominated degradation pathway involving sequential benzene-ring opening and pyridine-ring cleavage. This study presents a high-efficiency photocatalyst for industrial wastewater remediation and provides essential insights into rare-earth-modified TiO 2 systems.
研究领域:
环境科学
·
材料科学
·
光催化
·
化学工程
·
水污染治理
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2026
·
IF 3.4
Xiao-Mei Wu,Wei Kang,Quan-Fang Wang,Qing Cao,Wei-Wei Wang,Si-Yuan Ma,Jian-Feng Li,Jing-Hua Tian,Zhong-Qun Tian
To address the demand for high-rate and long-cycle-life cathode materials in the electric vehicle field, this research focuses on overcoming the intrinsic kinetic limitations of lithium iron phosphate (LiFePO4, LFP). By employing the rare-earth element gadolinium (Gd) as a multifunctional modifier, an innovative one-step modification strategy was developed. This approach achieves homogeneous bulk doping of LFP while simultaneously forming a thin protective surface coating in situ. The optimal LFP-1% Gd composite exhibits a high reversible capacity of 157.9 mAh g–1 at 0.1 C, accompanied by significantly reduced electrochemical polarization. Comprehensive characterization confirms that Gd3+ doping effectively expands the crystal lattice, thereby broadening Li+ diffusion pathways. In addition, the concomitant nanoscale surface coating stabilizes the electrode–electrolyte interphase and facilitates charge transfer. This synergistic dual-modification effect results in exceptional long-term cycle performance and superior rate performance. Specifically, it achieves 97.2% capacity retention after 900 cycles at 1 C and delivers 99.2 mAh g–1 at an ultrahigh rate of 20 C. This work elucidates a clear structure-performance relationship and provides a viable material design strategy for developing next-generation lithium-ion battery cathodes with high-rate and high-power.
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DOI
高影响因子
OPTICAL MATERIALS
·
2025
·
IF 4.2
Jianjun Zeng,Kuibao Zhang,Baozhu Luo
The non-stoichiometric design concept can effectively regulate internal defects in materials. Therefore, it can be applied to the fabrication of gadolinium zirconium oxide transparent ceramics to guide defect formation and promote the sintering process of the ceramics. In this study, transparent ceramics of non-stoichiometric Gd 2+X Zr 2 O 7+3X/2 with reduced Gd content were synthesized using a well-established combustion method combined with vacuum sintering. The XRD and TEM analyses revealed the presence of numerous defects within the crystal, leading to lattice shrinkage. These introduced defects significantly facilitated the sintering process, resulting in ceramics with high optical transmittance and large grain sizes. Furthermore, the band gap was found to vary correspondingly with changes in lattice parameters. These findings demonstrate that non-stoichiometric design provides an effective strategy to modulate defect concentration, enhance optical properties, and tune the band gap of the material.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Science China-Materials
·
2024
·Vol. 67
·期 12
·4101-4110
·
IF 6.8
Luo Meng,Guo Jiajing,Zhu Yi,Deng Jiali,Lu Hongwei,Li Lei,Wang Zhongling
Acidity-activatable magnetic resonance imaging (MRI) nanoprobes offer great potential for in vivo cancer imaging by targeting the acidic tumor microenvironment (TME). However, their effectiveness is limited by the delayed response at tumor sites and uncontrollable background noise, compromising imaging accuracy and reliability. Herein, an acidic TME-responsive nanoprobe, SPIO@ZIF-8@Gd (SZG), with dually activatable T 1 and T 2 MR signals is shown for acidity-selective contrast enhancement in a rapid response manner. It shows decreased T 1 and T 2 contrast intensity in normal physiological conditions. Once targeting acidic TME, the zeolitic imidazolate framework-8 (ZIF-8) layer undergoes instantaneous decomposition, releasing Gd 3+ ( T 1 -weighted), and exposing the inner SPIO ( T 2 -weighted) core, thereby sequentially recovering the signals. Compared to previously reported T 1 - T 2 nanoprobes, SZG demonstrates noticeable “dual activation” after just 30 min and reaches its peak 4 h after acid incubation. Additionally, it shows an excellent “acidity correlation” between relaxation times and pH values. When the SZG nanoprobe is used combined with “dual-contrast enhanced subtraction (DESI)”, the contrast difference between diseased and normal tissue can be increased by 10 times, which is significantly higher than traditional single-mode T 1 / T 2 contrast agents. Collectively, these findings demonstrate a rapid imaging strategy of dual-activation MR imaging of the acidic TME and simultaneous background suppression, thus paving the way for precise tumor malignancy differentiation, early tumor detection, and accurate tumor grading.
研究领域:
医学影像学
·
生物材料学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Shigang Hu,Mulan Liu,Song Wang,Shaobing Wu,Dong Zhu
The use of InGaN/GaN blue light chips to excite surface-coated yellow phosphors is one of the common strategies for the preparation of WLEDs. In this study, a series (Y,Gd) 3 Al 5 O 12 ((Y,Gd)AG) phosphors doped with different concentrations of Ce 3+ were prepared using the co-precipitation method. The yellow light emission intensity of the phosphor reaches its maximum at a Ce 3+ concentration of 5 %. This observation is consistent with theoretically quenching concentration (4.7 %) calculated by the Stern - Volmer formula and the optimal quantum yield (69.18 %). Further research indicates that the emission efficiency of the sample remains almost same after 7 days and maintained room temperature efficiency of 67 % at 400 K, with a color temperature value of 2662 K and a CRI value superior to that of YAG:Ce. The results TR-PL tests showed that when the concentration of Ce 3+ doping was gradually increased up 5 %, the distance between the emission centers becomes shorter, which leads to a decrease in the emission lifetime and thereby improves the luminous efficiency. When the concentration exceeds 5 %, concentration quenching leads to an increase in non-radiative processes, and this quenching mechanism is identified as energy transfer between Ce 3+ - Ce 3+ ions. This result provides ideas for obtaining highly efficient yellow phosphors, and also provides a realization path for improving the performance of CCTs and CRIs in WLEDs.
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DOI
高影响因子
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